From 332a498054039d026dcba122061997f0ed58e064 Mon Sep 17 00:00:00 2001
From: dragonmux <git@dragonmux.network>
Date: Fri, 19 Apr 2024 00:48:23 +0100
Subject: [PATCH] stm32/h7: Implemented handling for bringing up the 3.3V USB
 voltage supply

---
 include/libopencm3/stm32/h7/pwr.h | 3 +++
 lib/stm32/h7/pwr.c                | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/include/libopencm3/stm32/h7/pwr.h b/include/libopencm3/stm32/h7/pwr.h
index dd3943d1d8..b326c7c788 100644
--- a/include/libopencm3/stm32/h7/pwr.h
+++ b/include/libopencm3/stm32/h7/pwr.h
@@ -245,6 +245,9 @@ void pwr_set_svos_scale(enum pwr_svos_scale scale);
  * @param[in] scale  Voltage scale value to set.
  */
 void pwr_set_vos_scale(enum pwr_vos_scale scale);
+
+/** Enable and bring up the VDD33USB power supply for the USB controller */
+void pwr_enable_usb33(void);
 /**@}*/
 
 
diff --git a/lib/stm32/h7/pwr.c b/lib/stm32/h7/pwr.c
index ce6e4bafa8..2ce1c0b091 100644
--- a/lib/stm32/h7/pwr.c
+++ b/lib/stm32/h7/pwr.c
@@ -161,3 +161,10 @@ void pwr_set_vos_scale(enum pwr_vos_scale scale) {
 	}
 	while (!(PWR_D3CR & PWR_D3CR_VOSRDY));	/* VOSRDY bit is same between D3CR and SRDCR. */
 }
+
+void pwr_enable_usb33(void)
+{
+	PWR_CR3 |= PWR_CR3_USB33DEN;
+	while (!(PWR_CR3 & PWR_CR3_USB33RDY))
+		continue;
+}